ASN Wikibase Occurrence # 34629
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| Date: | Sunday 16 June 1991 |
| Time: | 19:15 LT |
| Type: | Bowers Flybaby 1A |
| Owner/operator: | James H. Otterback |
| Registration: | N8084D |
| MSN: | 70-30 |
| Total airframe hrs: | 250 hours |
| Engine model: | CONTINENTAL C-85-12F |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Stoughton, WI -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | Stoughton, WI |
| Waunakee, WI (WI06) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE PERFORMING AN AEROBATIC MANEUVER THE RIGHT WING FAILED AND DEPARTED THE AIRPLANE. THE AIRPLANE THEN DESCENDED INTO THE TERRAIN. SUBSEQUENT EXAMINATION REVEALED WOOD ROT AT THE FUSELAGE CARRY THRU SPAR ATTACHMENT WHERE THE FAILURE OCCURRED. EXAMINATION REVEALED SIMILAR ROT ON THE LEFT SIDE. THERE WERE NO DRAIN HOLES IN THE AREA OF THE SPAR ATTCHMENT WHERE MOISTURE COULD ACCUMULATE. IT WAS FURTHER DETERMINED THAT THE AREA WHERE THE DETERIORATION OCCURRED WAS NOT VISIBLE DURING NORMAL INSPECTION.
Probable Cause: THE INADEQUATE DESIGN BY THE MANUFACTURER TO PROVIDE FOR ADEQUATE PROTECTION FROM MOISTURE ACCUMULATION IN THE FORM OF DRAIN HOLES. CONTRIBUTING FACTORS WERE THE DETERIORATION (WOOD ROT) OF THE WING SPAR ATTACH AND THE LACK OF INSPECTION ACCESS.
Accident investigation:
 |
|
Sources:
NTSB CHI91DEP09
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 11-Apr-2024 14:44 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
Corrections or additions? ... Edit this accident description
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